UnitedHealthcare sued over automated algorithm delaying emergency claims
TeamHealth alleged that UnitedHealthcare used an automated algorithm to routinely deny or delay payments for emergency services based on diagnosis codes. The lawsuit claims these actions violate federal law and lead to systemic underpayment of providers.
UnitedHealthcare allegedly used an automated algorithm to routinely delay and deny claims based on specific diagnosis codes.
Key facts
- What
- TeamHealth alleged that UnitedHealthcare used an automated algorithm to routinely deny or delay payments for emergency services based on diagnosis codes.
- Incident date
- Jul 13, 2022
- Who
- UnitedHealthcare
- Failure mode
- Tool Misuse
- AI surface
- Search / RAG
- Severity
- High
What happened
On July 13, 2022, a subsidiary of TeamHealth, Fremont Emergency Services, filed a federal lawsuit against UnitedHealthcare. The complaint alleges that UnitedHealthcare used an automated algorithm to routinely delay and deny claims for emergency services based on specific diagnosis codes. The filings cite examples involving an infant with a traumatic brain injury and a child with a ruptured appendix.
What broke inside the model
- 01 · TriggerThe agent selects the correct tool.
- 02 · Model stepIt fills the call with the wrong arguments.
- 03 · Control gapNo validation checks the arguments first.
- 04 · FailureThe tool runs against the wrong target.
- 05 · ConsequenceThe wrong record, account, or system is hit.
At the tool call, the arguments point at the wrong target.
The automated adjudication system allegedly triggered denials or underpayments based on diagnosis codes regardless of actual medical necessity, functioning as a downcoding mechanism that overrode emergency physicians’ clinical judgments.
What it cost
Sources
Cite this entry
https://failureindex.ai/failures/unitedhealthcare-sued-automated-algorithm-delaying-emerAI Failure Index. "UnitedHealthcare sued over automated algorithm delaying emergency claims" (FI-0185). Realm Labs. https://failureindex.ai/failures/unitedhealthcare-sued-automated-algorithm-delaying-emer (indexed Jun 5, 2026).Data fields CC-BY 4.0, prose citation permitted. Incident ID FI-0185. Full dataset at /data.
Note from Realm Labs, the Index steward
How Realm would have caught this
- OmniGuard
- AgentRealm
Realm can inspect a tool call against the user's actual intent before it runs, and hold calls whose arguments or target do not match what was asked, so the wrong tool or the wrong arguments never reach the system of record.